drm/vmwgfx: Add and connect CRTC helper functions

Atomic mode set requires us to refactor existing vmw_stdu_crtc_set_config
code into sections that check the validity of the new mode, and sections
that actually program the hardware state.

vmw_du_crtc_atomic_check() takes CRTC-related checking code.  In a later
patch, vmw_du_primary_plane_atomic_check() will take framebuffer-related
checking code.

These helpers won't be called until we flip on the atomic support
flag or set drm_crtc_funcs->set_config to using the atomic
helper.

v2:
* The state->num_connector is actually the total number of potential
  connectors, not just the one associated with the display unit.
  The proper one to check is ->connector_mask.

* Add the check to only allow plane state to be the same as crtc state
  (Thanks to mlankhorst)

* Make sure to turn on SVGA mode before using VRAM.  SVGA mode is
  disabled in master_drop if dbdev is not running.

v3:
* Moved dot clock override to crtc_atomic_check

Signed-off-by: Sinclair Yeh <syeh@vmware.com>
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
Acked-by: Daniel Vetter <daniel@ffwll.ch>

drivers/gpu/drm/vmwgfx/vmwgfx_kms.c

@@ -390,6 +390,61 @@ void vmw_du_primary_plane_destroy(struct drm_plane *plane)
 }
 
 
+int vmw_du_crtc_atomic_check(struct drm_crtc *crtc,
+			     struct drm_crtc_state *new_state)
+{
+	struct vmw_display_unit *du = vmw_crtc_to_du(new_state->crtc);
+	int connector_mask = 1 << drm_connector_index(&du->connector);
+	bool has_primary = new_state->plane_mask &
+			   BIT(drm_plane_index(crtc->primary));
+
+	/* We always want to have an active plane with an active CRTC */
+	if (has_primary != new_state->enable)
+		return -EINVAL;
+
+
+	if (new_state->connector_mask != connector_mask &&
+	    new_state->connector_mask != 0) {
+		DRM_ERROR("Invalid connectors configuration\n");
+		return -EINVAL;
+	}
+
+	/*
+	 * Our virtual device does not have a dot clock, so use the logical
+	 * clock value as the dot clock.
+	 */
+	if (new_state->mode.crtc_clock == 0)
+		new_state->adjusted_mode.crtc_clock = new_state->mode.clock;
+
+	return 0;
+}
+
+
+void vmw_du_crtc_atomic_begin(struct drm_crtc *crtc,
+			      struct drm_crtc_state *old_crtc_state)
+{
+}
+
+
+void vmw_du_crtc_atomic_flush(struct drm_crtc *crtc,
+			      struct drm_crtc_state *old_crtc_state)
+{
+	struct drm_pending_vblank_event *event = crtc->state->event;
+
+	if (event) {
+		crtc->state->event = NULL;
+
+		spin_lock_irq(&crtc->dev->event_lock);
+		if (drm_crtc_vblank_get(crtc) == 0)
+			drm_crtc_arm_vblank_event(crtc, event);
+		else
+			drm_crtc_send_vblank_event(crtc, event);
+		spin_unlock_irq(&crtc->dev->event_lock);
+	}
+
+}
+
+
 /**
  * vmw_du_crtc_duplicate_state - duplicate crtc state
  * @crtc: DRM crtc

drivers/gpu/drm/vmwgfx/vmwgfx_kms.h

@@ -161,6 +161,7 @@ struct vmw_crtc_state {
  * @surf Display surface for STDU
  * @dmabuf display dmabuf for SOU
  * @content_fb_type Used by STDU.
+ * @dmabuf_size Size of the dmabuf, used by Screen Object Display Unit
  * @pinned pin count for STDU display surface
  */
 struct vmw_plane_state {
@@ -169,6 +170,7 @@ struct vmw_plane_state {
 	struct vmw_dma_buffer *dmabuf;
 
 	int content_fb_type;
+	unsigned long dmabuf_size;
 
 	int pinned;
 };
@@ -342,10 +344,17 @@ int vmw_du_cursor_plane_update(struct drm_plane *plane,
 			       uint32_t src_x, uint32_t src_y,
 			       uint32_t src_w, uint32_t src_h);
 
+/* Atomic Helpers */
 void vmw_du_plane_reset(struct drm_plane *plane);
 struct drm_plane_state *vmw_du_plane_duplicate_state(struct drm_plane *plane);
 void vmw_du_plane_destroy_state(struct drm_plane *plane,
 				struct drm_plane_state *state);
+int vmw_du_crtc_atomic_check(struct drm_crtc *crtc,
+			     struct drm_crtc_state *state);
+void vmw_du_crtc_atomic_begin(struct drm_crtc *crtc,
+			      struct drm_crtc_state *old_crtc_state);
+void vmw_du_crtc_atomic_flush(struct drm_crtc *crtc,
+			      struct drm_crtc_state *old_crtc_state);
 void vmw_du_crtc_reset(struct drm_crtc *crtc);
 struct drm_crtc_state *vmw_du_crtc_duplicate_state(struct drm_crtc *crtc);
 void vmw_du_crtc_destroy_state(struct drm_crtc *crtc,

drivers/gpu/drm/vmwgfx/vmwgfx_ldu.c

@@ -167,6 +167,7 @@ static int vmw_ldu_add_active(struct vmw_private *vmw_priv,
 	if (vfb != ld->fb) {
 		if (ld->fb && ld->fb->unpin)
 			ld->fb->unpin(ld->fb);
+		vmw_svga_enable(vmw_priv);
 		if (vfb->pin)
 			vfb->pin(vfb);
 		ld->fb = vfb;
@@ -190,6 +191,68 @@ static int vmw_ldu_add_active(struct vmw_private *vmw_priv,
 	return 0;
 }
 
+/**
+ * vmw_ldu_crtc_mode_set_nofb - Enable svga
+ *
+ * @crtc: CRTC associated with the new screen
+ *
+ * For LDU, just enable the svga
+ */
+static void vmw_ldu_crtc_mode_set_nofb(struct drm_crtc *crtc)
+{
+}
+
+/**
+ * vmw_ldu_crtc_helper_prepare - Noop
+ *
+ * @crtc: CRTC associated with the new screen
+ *
+ * Prepares the CRTC for a mode set, but we don't need to do anything here.
+ *
+ */
+static void vmw_ldu_crtc_helper_prepare(struct drm_crtc *crtc)
+{
+}
+
+/**
+ * vmw_ldu_crtc_helper_commit - Noop
+ *
+ * @crtc: CRTC associated with the new screen
+ *
+ * This is called after a mode set has been completed.  Here's
+ * usually a good place to call vmw_ldu_add_active/vmw_ldu_del_active
+ * but since for LDU the display plane is closely tied to the
+ * CRTC, it makes more sense to do those at plane update time.
+ */
+static void vmw_ldu_crtc_helper_commit(struct drm_crtc *crtc)
+{
+	struct vmw_private *dev_priv;
+	struct vmw_legacy_display_unit *ldu;
+	struct vmw_framebuffer *vfb;
+	struct drm_framebuffer *fb;
+
+
+	ldu = vmw_crtc_to_ldu(crtc);
+	dev_priv = vmw_priv(crtc->dev);
+	fb       = crtc->primary->fb;
+
+	vfb = (fb) ? vmw_framebuffer_to_vfb(fb) : NULL;
+
+	if (vfb)
+		vmw_ldu_add_active(dev_priv, ldu, vfb);
+	else
+		vmw_ldu_del_active(dev_priv, ldu);
+}
+
+/**
+ * vmw_ldu_crtc_helper_disable - Turns off CRTC
+ *
+ * @crtc: CRTC to be turned off
+ */
+static void vmw_ldu_crtc_helper_disable(struct drm_crtc *crtc)
+{
+}
+
 static int vmw_ldu_crtc_set_config(struct drm_mode_set *set)
 {
 	struct vmw_private *dev_priv;
@@ -346,6 +409,20 @@ static const struct drm_plane_funcs vmw_ldu_cursor_funcs = {
 	.atomic_destroy_state = vmw_du_plane_destroy_state,
 };
 
+/*
+ * Atomic Helpers
+ */
+static const struct drm_crtc_helper_funcs vmw_ldu_crtc_helper_funcs = {
+	.prepare = vmw_ldu_crtc_helper_prepare,
+	.commit = vmw_ldu_crtc_helper_commit,
+	.disable = vmw_ldu_crtc_helper_disable,
+	.mode_set = drm_helper_crtc_mode_set,
+	.mode_set_nofb = vmw_ldu_crtc_mode_set_nofb,
+	.atomic_check = vmw_du_crtc_atomic_check,
+	.atomic_begin = vmw_du_crtc_atomic_begin,
+	.atomic_flush = vmw_du_crtc_atomic_flush,
+};
+
 
 static int vmw_ldu_init(struct vmw_private *dev_priv, unsigned unit)
 {
@@ -445,6 +522,8 @@ static int vmw_ldu_init(struct vmw_private *dev_priv, unsigned unit)
 		goto err_free_unregister;
 	}
 
+	drm_crtc_helper_add(crtc, &vmw_ldu_crtc_helper_funcs);
+
 	drm_mode_crtc_set_gamma_size(crtc, 256);
 
 	drm_object_attach_property(&connector->base,

drivers/gpu/drm/vmwgfx/vmwgfx_scrn.c

@@ -250,6 +250,109 @@ static int vmw_sou_backing_alloc(struct vmw_private *dev_priv,
 	return ret;
 }
 
+/**
+ * vmw_sou_crtc_mode_set_nofb - Create new screen
+ *
+ * @crtc: CRTC associated with the new screen
+ *
+ * This function creates/destroys a screen.  This function cannot fail, so if
+ * somehow we run into a failure, just do the best we can to get out.
+ */
+static void vmw_sou_crtc_mode_set_nofb(struct drm_crtc *crtc)
+{
+	struct vmw_private *dev_priv;
+	struct vmw_screen_object_unit *sou;
+	struct vmw_framebuffer *vfb;
+	struct drm_framebuffer *fb;
+	struct drm_plane_state *ps;
+	struct vmw_plane_state *vps;
+	int ret;
+
+
+	sou      = vmw_crtc_to_sou(crtc);
+	dev_priv = vmw_priv(crtc->dev);
+	ps       = crtc->primary->state;
+	fb       = ps->fb;
+	vps      = vmw_plane_state_to_vps(ps);
+
+	vfb = (fb) ? vmw_framebuffer_to_vfb(fb) : NULL;
+
+	if (sou->defined) {
+		ret = vmw_sou_fifo_destroy(dev_priv, sou);
+		if (ret) {
+			DRM_ERROR("Failed to destroy Screen Object\n");
+			return;
+		}
+	}
+
+	if (vfb) {
+		sou->buffer = vps->dmabuf;
+		sou->buffer_size = vps->dmabuf_size;
+
+		ret = vmw_sou_fifo_create(dev_priv, sou, crtc->x, crtc->y,
+					  &crtc->mode);
+		if (ret)
+			DRM_ERROR("Failed to define Screen Object %dx%d\n",
+				  crtc->x, crtc->y);
+
+		vmw_kms_add_active(dev_priv, &sou->base, vfb);
+	} else {
+		sou->buffer = NULL;
+		sou->buffer_size = 0;
+
+		vmw_kms_del_active(dev_priv, &sou->base);
+	}
+}
+
+/**
+ * vmw_sou_crtc_helper_prepare - Noop
+ *
+ * @crtc: CRTC associated with the new screen
+ *
+ * Prepares the CRTC for a mode set, but we don't need to do anything here.
+ */
+static void vmw_sou_crtc_helper_prepare(struct drm_crtc *crtc)
+{
+}
+
+/**
+ * vmw_sou_crtc_helper_commit - Noop
+ *
+ * @crtc: CRTC associated with the new screen
+ *
+ * This is called after a mode set has been completed.
+ */
+static void vmw_sou_crtc_helper_commit(struct drm_crtc *crtc)
+{
+}
+
+/**
+ * vmw_sou_crtc_helper_disable - Turns off CRTC
+ *
+ * @crtc: CRTC to be turned off
+ */
+static void vmw_sou_crtc_helper_disable(struct drm_crtc *crtc)
+{
+	struct vmw_private *dev_priv;
+	struct vmw_screen_object_unit *sou;
+	int ret;
+
+
+	if (!crtc) {
+		DRM_ERROR("CRTC is NULL\n");
+		return;
+	}
+
+	sou = vmw_crtc_to_sou(crtc);
+	dev_priv = vmw_priv(crtc->dev);
+
+	if (sou->defined) {
+		ret = vmw_sou_fifo_destroy(dev_priv, sou);
+		if (ret)
+			DRM_ERROR("Failed to destroy Screen Object\n");
+	}
+}
+
 static int vmw_sou_crtc_set_config(struct drm_mode_set *set)
 {
 	struct vmw_private *dev_priv;
@@ -527,6 +630,20 @@ static const struct drm_plane_funcs vmw_sou_cursor_funcs = {
 	.atomic_destroy_state = vmw_du_plane_destroy_state,
 };
 
+/*
+ * Atomic Helpers
+ */
+static const struct drm_crtc_helper_funcs vmw_sou_crtc_helper_funcs = {
+	.prepare = vmw_sou_crtc_helper_prepare,
+	.commit = vmw_sou_crtc_helper_commit,
+	.disable = vmw_sou_crtc_helper_disable,
+	.mode_set = drm_helper_crtc_mode_set,
+	.mode_set_nofb = vmw_sou_crtc_mode_set_nofb,
+	.atomic_check = vmw_du_crtc_atomic_check,
+	.atomic_begin = vmw_du_crtc_atomic_begin,
+	.atomic_flush = vmw_du_crtc_atomic_flush,
+};
+
 
 static int vmw_sou_init(struct vmw_private *dev_priv, unsigned unit)
 {
@@ -626,6 +743,8 @@ static int vmw_sou_init(struct vmw_private *dev_priv, unsigned unit)
 		goto err_free_unregister;
 	}
 
+	drm_crtc_helper_add(crtc, &vmw_sou_crtc_helper_funcs);
+
 	drm_mode_crtc_set_gamma_size(crtc, 256);
 
 	drm_object_attach_property(&connector->base,